![]() ![]() Picture a bunch of cursive 'o's strung together. When you've wound all of the coils, the stack assembly is taken apart, leaving you with several individual coils connected by a wire. Between each disc, a coil for each slot is wound. Each disc has a small groove in the OD to allow the wire to pass across the disc for the next coil. The stack is basically a bunch of discs and bushings. PLus, you'll likely find a suitable replacement for not a lot of dough.īasically it involves winding the correct number of turns on a specific number of coils (one coil for each slot in the motor's stator) of the right gauge wire on what's called a stack fixture. Why throw it out? Here's why: Rewinding a stepper motor is not trivial and WAY more complicated than rewinding a typical induction, 3-phase or DC brush motor. Most stepper motors follow a standard NEMA or ISO form factor so a drop in replacement should be relatively easy to find. If the problem isn't a broken connection just get a new motor. Some suitable shim stock inserted between the rotor and stator will help prevent this. When you take the motor apart, be careful not to chip any of the magnets. You'll usually get a shorted turn or a short to case if the the motor has been overheated. It's very rare for there to be an open magnet wire in the stator core. I'd venture to say one of the lead wires is broken just inside the case or where the lead wire is soldered to the magnet wire internally. ![]()
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January 2023
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